$\int e^{3x}\cos\left(bx\right)dx$
$\log\left(a^2bc\right)$
$\frac{dy}{dx}+\frac{4y}{x}=x^2-1$
$2a-6$
$\frac{d^2}{dx^2}\left(2xe^{-x}\right)$
$5x-7\le10x+30$
$a^4+5a^2+4\:\left(7a\right)^2$
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